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Unwind the stack on task failure

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When a task fails, we will throw an exception, then catch it at the bottom of
the stack.

On Windows we don't do this yet because the exception doesn't propagate
correctly.

No cleanups yet.

Issue #236
This commit is contained in:
Brian Anderson
2011-09-06 18:31:41 -07:00
parent c337fd5467
commit c047cfb710
2 changed files with 41 additions and 8 deletions
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48
src/rt/rust_task.cpp
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@@ -147,12 +147,6 @@ void task_exit(rust_closure_env *env, int rval, rust_task *task) {
//env->td->free_glue(NULL, task, NULL, env->td->first_param, env);
task->free(env);
}
task->die();
task->lock.lock();
task->notify_tasks_waiting_to_join();
task->lock.unlock();
task->yield(1);
}
extern "C" CDECL
@@ -161,8 +155,37 @@ void task_start_wrapper(spawn_args *a)
rust_task *task = a->task;
int rval = 42;
a->f(&rval, task, a->a3, a->a4);
task_exit((rust_closure_env*)a->a3, rval, task);
bool failed = false;
try {
a->f(&rval, task, a->a3, a->a4);
} catch (rust_task *ex) {
A(task->sched, ex == task,
"Expected this task to be thrown for unwinding");
failed = true;
}
rust_closure_env* env = (rust_closure_env*)a->a3;
if(env) {
// free the environment.
I(task->sched, 1 == env->ref_count); // the ref count better be 1
//env->td->drop_glue(NULL, task, NULL, env->td->first_param, env);
//env->td->free_glue(NULL, task, NULL, env->td->first_param, env);
task->free(env);
}
if (failed) {
#ifndef __WIN32__
task->conclude_failure();
#else
A(task->sched, false, "Shouldn't happen");
#endif
} else {
task->die();
task->lock.lock();
task->notify_tasks_waiting_to_join();
task->lock.unlock();
task->yield(1);
}
}
/* We spawn a rust (fastcc) function through a CDECL function
@@ -276,6 +299,15 @@ rust_task::fail() {
// See note in ::kill() regarding who should call this.
DLOG(sched, task, "task %s @0x%" PRIxPTR " failing", name, this);
backtrace();
#ifndef __WIN32__
throw this;
#else
conclude_failure();
#endif
}
void
rust_task::conclude_failure() {
die();
// Unblock the task so it can unwind.
unblock();